/*  Starshatter OpenSource Distribution
    Copyright (c) 1997-2004, Destroyer Studios LLC.
    All Rights Reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.
    * Neither the name "Destroyer Studios" nor the names of its contributors
      may be used to endorse or promote products derived from this software
      without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.

    SUBSYSTEM:    nGenEx.lib
    FILE:         Archive.cpp
    AUTHOR:       John DiCamillo

*/

#include "MemDebug.h"
#include "Types.h"
#include "Archive.h"

#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <io.h>
#include <stdio.h>
#include <time.h>

#include "zlib.h"

// +--------------------------------------------------------------------+

void Print(const char* fmt, ...);

int verbose = 1;
int err;

#define CHECK_ERR(err, msg) { \
        if (err != Z_OK) { \
            fprintf(stderr, "%s error: %d\n", msg, err); \
            exit(1); \
        } \
    }

// +--------------------------------------------------------------------+

DataArchive::DataArchive(const char* name)
{
    ZeroMemory(this, sizeof(DataArchive));

    if (name)
    LoadDatafile(name);
}

DataArchive::~DataArchive()
{
    delete [] block_map;
    delete [] directory;
}

// +--------------------------------------------------------------------+

void DataArchive::WriteEntry(int index, BYTE* buf)
{
    int f = _open(datafile, _O_RDWR|_O_CREAT|_O_BINARY, _S_IREAD|_S_IWRITE);

    if (f != -1) {
        header.dir_size_comp = DirBlocks() * BLOCK_SIZE;
        dirbuf = new(__FILE__,__LINE__) BYTE[header.dir_size_comp];

        if (!dirbuf) {
            err = Z_MEM_ERROR;
        }

        else {
            err = compress(dirbuf, &header.dir_size_comp, 
            (BYTE*) directory, header.nfiles * sizeof(DataEntry));
            CHECK_ERR(err, "compress");

            header.dir_blocks = Blocks(header.dir_size_comp) * BLOCK_SIZE;

            _lseek(f, 0, SEEK_SET);
            _write(f, &header, sizeof(DataHeader));
            _lseek(f, sizeof(DataHeader) + header.dir_offset, SEEK_SET);
            _write(f, dirbuf, header.dir_blocks);
            
            delete [] dirbuf;
            dirbuf = 0;
        }
        
        if (buf && directory && directory[index].size_comp) {
            _lseek(f, sizeof(DataHeader) + directory[index].offset, SEEK_SET);
            _write(f, buf, directory[index].size_comp);
        }
        _close(f);
    }
    else
    perror("WriteEntry");
}

// +--------------------------------------------------------------------+

DWORD DataArchive::Blocks(DWORD raw_size)
{
    int full_blocks =  raw_size / BLOCK_SIZE;
    int part_blocks = (raw_size % BLOCK_SIZE) > 0;

    return full_blocks + part_blocks;
}

DWORD DataArchive::DirBlocks()
{
    DWORD result = Blocks(header.nfiles * sizeof(DataEntry));
    if (result == 0) result = 1;
    return result;
}

DWORD DataArchive::FileBlocks(int index)
{
    if (index >= 0 && index < (int) header.nfiles && directory)
    return Blocks(directory[index].size_comp);

    return 0;
}

// +--------------------------------------------------------------------+

void DataArchive::CreateBlockMap()
{
    delete [] block_map;
    block_map = 0;

    if (header.nfiles == 0) return;

    DWORD i,j;
    DWORD dir_usage = header.dir_offset + DirBlocks() * BLOCK_SIZE;
    DWORD max_usage = dir_usage;

    for (i = 0; i < header.nfiles; i++) {
        DWORD last_block = directory[i].offset + FileBlocks(i) * BLOCK_SIZE;
        if (last_block > max_usage)
        max_usage = last_block;
    }

    nblocks   = max_usage/BLOCK_SIZE;
    block_map = new(__FILE__,__LINE__) DWORD[nblocks];

    if (!block_map) {
        nblocks = 0;
    }

    else {
        ZeroMemory(block_map, nblocks*sizeof(DWORD));

        DWORD first_block = header.dir_offset/BLOCK_SIZE + 
        (header.dir_offset%BLOCK_SIZE > 0);
        
        for (j = 0; j < DirBlocks(); j++)
        block_map[first_block+j] = 1;

        for (i = 0; i < header.nfiles; i++) {
            DWORD first_block = directory[i].offset/BLOCK_SIZE + 
            (directory[i].offset%BLOCK_SIZE > 0);
            
            for (j = 0; j < FileBlocks(i); j++)
            block_map[first_block+j] = i+2;
        }
    }
}

// +--------------------------------------------------------------------+

int DataArchive::FindDataBlocks(int need)
{
    if ((int) (nblocks)-need > 0) {
        DWORD start;
        int   i;

        for (start = 0; start < nblocks-need; start++) {
            for (i = 0; block_map[start+i] == 0 && i < need; i++);
            
            if (i == need) return start*BLOCK_SIZE;
            
            start += i;
        }
    }

    return nblocks*BLOCK_SIZE;
}

// +--------------------------------------------------------------------+

void DataArchive::LoadDatafile(const char* name)
{
    if (!name) return;

    delete [] directory;
    delete [] block_map;

    ZeroMemory(this, sizeof(DataArchive));
    strncpy_s(datafile, name, NAMELEN-1);

    FILE* f; 
    fopen_s(&f, datafile, "rb");
    if (f) {
        fread(&header, sizeof(DataHeader), 1, f);
        
        if (header.version != VERSION) {
            Print("ERROR: datafile '%s' invalid version '%d'\n",
            datafile, header.version);
            fclose(f);
            ZeroMemory(&header, sizeof(header));
            return;
        }

        DWORD len      = DirBlocks() * BLOCK_SIZE;
        DWORD dirsize  = header.nfiles + 64;

        dirbuf    = new(__FILE__,__LINE__) BYTE[len];
        directory = new(__FILE__,__LINE__) DataEntry[dirsize];

        if (!dirbuf || !directory) {
            err = Z_MEM_ERROR;
        }

        else {
            ZeroMemory(directory, sizeof(DataEntry) * dirsize);

            fseek(f, sizeof(DataHeader) + header.dir_offset, SEEK_SET);
            fread(dirbuf, header.dir_size_comp, 1, f);

            int err = uncompress((BYTE*) directory, &len,
#pragma warning(suppress: 6029)
            dirbuf, header.dir_size_comp);
            if (err != Z_OK)
            ZeroMemory(directory, sizeof(DataEntry) * dirsize);
            
            delete [] dirbuf;
            dirbuf = 0;

            CreateBlockMap();
        }
    }
    else {
        Print("Creating Archive '%s'...\n", datafile);
        
        header.version       = VERSION;
        header.nfiles        = 0;
        header.dir_blocks    = 0;
        header.dir_size_comp = 0;
        header.dir_offset    = 0;
        
        nblocks = DirBlocks();
        
        delete [] block_map;
        block_map = 0;
    }
}

// +--------------------------------------------------------------------+

int DataArchive::FindEntry(const char* req_name)
{
    int entry = -1;

    if (req_name && *req_name && directory) {
        char path[256];
        int  len = strlen(req_name);

        ZeroMemory(path, sizeof(path));

        for (int c = 0; c < len; c++) {
            if (req_name[c] == '\\')
            path[c] = '/';
            else
            path[c] = req_name[c];
        }

        for (DWORD i = 0; i < header.nfiles; i++) {
            if (!_stricmp(directory[i].name, path))
            return i;
        }
    }

    return entry;
}

// +--------------------------------------------------------------------+

BYTE* DataArchive::CompressEntry(int i)
{
    if (directory && i >= 0 && i < (int) header.nfiles) {
        char* name = directory[i].name;

        FILE* f;
        fopen_s(&f, name, "rb");

        if (f) {
            fseek(f, 0, SEEK_END);
            DWORD len = ftell(f);
            fseek(f, 0, SEEK_SET);

            BYTE* buf = new(__FILE__,__LINE__) BYTE[len];

            if (!buf) {
                err = Z_MEM_ERROR;
            }

            else {
                fread(buf, len, 1, f);
                fclose(f);

                directory[i].size_orig = len;
                
                directory[i].size_comp = (int) (len * 1.1);
                BYTE* cbuf = new(__FILE__,__LINE__) BYTE[directory[i].size_comp];

                if (!cbuf) {
                    err = Z_MEM_ERROR;
                }
                else {
                    err = compress(cbuf, &directory[i].size_comp, buf, len);
                    CHECK_ERR(err, "compress");
                }

                delete [] buf;
                return cbuf;
            }
        }
    }

    return 0;
}

// +--------------------------------------------------------------------+

int DataArchive::ExpandEntry(int i, BYTE*& buf, bool null_terminate)
{
    DWORD len = 0;

    if (directory && i >= 0 && i < (int) header.nfiles) {
        FILE* f;
        fopen_s(&f, datafile, "rb");

        if (f) {
            DWORD clen = directory[i].size_comp;
            BYTE* cbuf = new(__FILE__,__LINE__) BYTE[clen];

            if (!cbuf) {
                err = Z_MEM_ERROR;
            }

            else {
                fseek(f, sizeof(DataHeader) + directory[i].offset, SEEK_SET);
                fread(cbuf, clen, 1, f);

                len = directory[i].size_orig;

                if (null_terminate) {
                    buf = new(__FILE__,__LINE__) BYTE[len+1];
                    if (buf) buf[len] = 0;
                }

                else {
                    buf = new(__FILE__,__LINE__) BYTE[len];
                }

                if (!buf) {
                    err = Z_MEM_ERROR;
                }

                else {
                    err = uncompress(buf, &len, cbuf, clen);
                    if (err != Z_OK) {
                        delete [] buf;
                        buf = 0;
                    }
                }

                delete [] cbuf;
                fclose(f);
            }
        }
    }

    return len;
}

// +--------------------------------------------------------------------+

int DataArchive::InsertEntry(const char* name)
{
    if (name && *name) {
        char  path[256];
        DWORD len = strlen(name);

        ZeroMemory(path, sizeof(path));

        for (DWORD c = 0; c < len; c++) {
            if (name[c] == '\\')
            path[c] = '/';
            else
            path[c] = name[c];
        }

        int dirsize = header.nfiles + 64;

        if (directory && dirsize) {
            for (int i = 0; i < dirsize; i++) {
                if (directory[i].size_orig == 0) {
                    ZeroMemory(directory[i].name, NAMELEN);
                    strncpy_s(directory[i].name, path, NAMELEN);
                    directory[i].name[NAMELEN-1] = '\0';
                    directory[i].size_orig = 1;
                    
                    return i;
                }
            }
        }

        DataEntry* dir = new(__FILE__,__LINE__) DataEntry[dirsize + 64];

        if (directory && dirsize) {
            ZeroMemory(dir, (dirsize + 64) * sizeof(DataEntry));
            CopyMemory(dir, directory, dirsize * sizeof(DataEntry));
        }

        delete [] directory;

        header.nfiles = dirsize + 64;
        directory     = dir;

        ZeroMemory(directory[dirsize].name, NAMELEN);
        strncpy_s(directory[dirsize].name, path, NAMELEN);
        directory[dirsize].name[NAMELEN-1] = '\0';
        directory[dirsize].size_orig = 1;

        return dirsize;
    }

    return -1;
}

// +--------------------------------------------------------------------+

void DataArchive::RemoveEntry(int index)
{
    if (directory && index >= 0 && index < (int) header.nfiles)
    ZeroMemory(&directory[index], sizeof(DataEntry));
}

// +--------------------------------------------------------------------+

void DataArchive::Insert(const char* name)
{
    DWORD old_blocks = 0,     old_offset = 0,     new_blocks = 0;
    DWORD old_dir_blocks = 0, old_dir_offset = 0, new_dir_blocks = 0;
    int   added = 0;

    int index = FindEntry(name);

    if (index < 0) {
        old_dir_blocks = DirBlocks();
        old_dir_offset = header.dir_offset;
        
        index = InsertEntry(name);
        
        if (index >= (int) header.nfiles) {
            header.nfiles = index+1;
            added = 1;
        }

        new_dir_blocks = DirBlocks();
        
        if (new_dir_blocks > old_dir_blocks) {
            header.dir_offset = FindDataBlocks(new_dir_blocks);
            CreateBlockMap();
        }
    }
    else {
        old_blocks = FileBlocks(index);
        old_offset = directory[index].offset;
    }

    if (index >= 0) {
        DataEntry& e = directory[index];
        
        if (verbose) Print("   Inserting: %-16s ", e.name);

        BYTE* buf = CompressEntry(index);
        
        if (!buf) {
            // this is (almost) unrecoverable,
            // so we quit before screwing things up:
            Print("ERROR: Could not compress %d:%s\n", index, directory[index].name);
            exit(1);
        }

        new_blocks = FileBlocks(index);
        
        // the file is new, or got bigger,
        // need to find room for the data:
        if (new_blocks > old_blocks) {
            directory[index].offset = FindDataBlocks(new_blocks);
            CreateBlockMap();
        }

        WriteEntry(index, buf);
        delete [] buf;
        
        if (verbose) {
            int    ratio = (int) (100.0 * (double) e.size_comp / (double) e.size_orig);
            Print("%9d => %9d (%2d%%)\n", e.size_orig, e.size_comp, ratio);
        }
    }
    else if (added)
    header.nfiles--;
}

// +--------------------------------------------------------------------+

void DataArchive::Extract(const char* name)
{
    int index = FindEntry(name);

    if (!directory || index < 0 || index >= (int) header.nfiles) {
        Print("Could not extract '%s', not found\n", name);
        return;
    }

    BYTE* buf;
    ExpandEntry(index, buf);

    FILE* f;
    fopen_s(&f, directory[index].name, "wb");
    if (f) {
        fwrite(buf, directory[index].size_orig, 1, f);
        fclose(f);
    }
    else
    Print("Could not extract '%s', could not open file for writing\n", name);

    delete [] buf;

    if (verbose) Print("   Extracted: %s\n", name);
}

// +--------------------------------------------------------------------+

void DataArchive::Remove(const char* name)
{
    int index = FindEntry(name);

    if (!directory || index < 0 || index >= (int) header.nfiles) {
        Print("Could not remove '%s', not found\n", name);
        return;
    }

    RemoveEntry(index);
    WriteEntry(index, 0);

    if (verbose) Print("   Removed: %s\n", name);
}

// +--------------------------------------------------------------------+

void DataArchive::List()
{
    int total_orig = 0;
    int total_comp = 0;

    printf("DATAFILE: %s\n", datafile);
    printf("Files:    %d\n", header.nfiles); //-V576
    printf("\n");

    if (directory && header.nfiles) {
        printf("Index  Orig Size  Comp Size  Ratio  Name\n");
        printf("-----  ---------  ---------  -----  ----------------\n");

        for (DWORD i = 0; i < header.nfiles; i++) {
            DataEntry& e = directory[i];
            int    ratio = (int) (100.0 * (double) e.size_comp / (double) e.size_orig);
            
            printf("%5d  %9d  %9d   %2d%%   %s\n", i+1, e.size_orig, e.size_comp, ratio, e.name); //-V576
            
            total_orig += e.size_orig;
            total_comp += e.size_comp;
        }

        int total_ratio = (int) (100.0 * (double) total_comp / (double) total_orig);

        printf("-----  ---------  ---------  -----\n");
        printf("TOTAL  %9d  %9d   %2d%%\n\n", total_orig, total_comp, total_ratio);
    }
}


// +--------------------------------------------------------------------+

